Embedded Peripherals IP User Guide

ID 683130
Date 10/18/2021
Public

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Document Table of Contents
1. Introduction 2. Avalon® -ST Multi-Channel Shared Memory FIFO Core 3. Avalon® -ST Single-Clock and Dual-Clock FIFO Cores 4. Avalon® -ST Serial Peripheral Interface Core 5. SPI Core 6. SPI Agent/JTAG to Avalon® Host Bridge Cores 7. Intel eSPI Agent Core 8. eSPI to LPC Bridge Core 9. Ethernet MDIO Core 10. Intel FPGA 16550 Compatible UART Core 11. UART Core 12. JTAG UART Core 13. Intel FPGA Avalon® Mailbox Core 14. Intel FPGA Avalon® Mutex Core 15. Intel FPGA Avalon® I2C (Host) Core 16. Intel FPGA I2C Agent to Avalon® -MM Host Bridge Core 17. Intel FPGA Avalon® Compact Flash Core 18. EPCS/EPCQA Serial Flash Controller Core 19. Intel FPGA Serial Flash Controller Core 20. Intel FPGA Serial Flash Controller II Core 21. Intel FPGA Generic QUAD SPI Controller Core 22. Intel FPGA Generic QUAD SPI Controller II Core 23. Interval Timer Core 24. Intel FPGA Avalon FIFO Memory Core 25. On-Chip Memory (RAM and ROM) Core 26. On-Chip Memory II (RAM or ROM) 27. Optrex 16207 LCD Controller Core 28. PIO Core 29. PLL Cores 30. DMA Controller Core 31. Modular Scatter-Gather DMA Core 32. Scatter-Gather DMA Controller Core 33. SDRAM Controller Core 34. Tri-State SDRAM Core 35. Video Sync Generator and Pixel Converter Cores 36. Intel FPGA Interrupt Latency Counter Core 37. Performance Counter Unit Core 38. Vectored Interrupt Controller Core 39. Avalon® -ST Data Pattern Generator and Checker Cores 40. Avalon® -ST Test Pattern Generator and Checker Cores 41. System ID Peripheral Core 42. Avalon® Packets to Transactions Converter Core 43. Avalon® -ST Multiplexer and Demultiplexer Cores 44. Avalon® -ST Bytes to Packets and Packets to Bytes Converter Cores 45. Avalon® -ST Delay Core 46. Avalon® -ST Round Robin Scheduler Core 47. Avalon® -ST Splitter Core 48. Avalon® -MM DDR Memory Half Rate Bridge Core 49. Intel FPGA GMII to RGMII Converter Core 50. Intel FPGA MII to RMII Converter Core 51. Intel FPGA HPS GMII to TSE 1000BASE-X/SGMII PCS Bridge Core 52. Intel FPGA HPS EMAC to Multi-rate PHY GMII Adapter Core 53. Intel FPGA MSI to GIC Generator Core

10.4.5. lcr

Identifier Title Offset Access Reset Value Description
lcr Line Control Register 0xC RW 0x00000000 Formats serial data.
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
-
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- dls9 dlab break sp eps pen stop dls
Table 80.  lcr Fields Description
Bit Name/Identifier Description Access Reset
[31:9] - Reserved R 0x0
[8] Data Length Select (dls9) Issue 1'b1 to LCR[8] and 2'b00 to LCR[1:0] to turn on 9 data bits per character that the peripheral will transmit and receive. RW 0x0
[7] Divisor Latch Access Bit (dlab)

This is used to enable reading and writing of the Divisor Latch register (DLL and DLH) to set the baud rate of the UART. This bit must be cleared after initial baud rate setup in order to access other registers.

RW 0x0
[6] Break Control Bit (break)

This is used to cause a break condition to be transmitted to the receiving device. If set to one the serial output is forced to the spacing (logic 0) state until the Break bit is cleared.

RW 0x0
[5] Stick Parity (sp) The SP bit works in conjunction with the EPS and PEN bits. When odd parity is selected (EPS = 0), the PARITY bit is transmitted and checked as set. When even parity is selected (EPS = 1), the PARITY bit is transmitted and checked as cleared. RW 0x0
[4] Even Parity Select (eps)

This is used to select between even and odd parity, when parity is enabled (PEN set to one). If set to one, an even number of logic '1's is transmitted or checked. If set to zero, an odd number of logic '1's is transmitted or checked.

RW 0x0
[3] Parity Enable (pen)

This bit is used to enable and disable parity generation and detection in a transmitted and received data character.

RW 0x0
[2] Stop Bits (stop)
Number of stop bits. This is used to select the number of stop bits per character that the peripheral will transmit and receive. Note that regardless of the number of stop bits selected the receiver will only check the first stop bit.
Data Bits LCR[2] = 0 LCR[2] = 1
5 1 1.5
6 1 2
7 1 2
8 1 2
  • If bit 2 is a logic 0, one stop bit is generated in the transmitted data.
  • If bit 2 is a logic 1 when a 5-bit word length is selected through bits 0 and 1, one and a half stop bits are generated.
  • If bit 2 is a logic 1 when either a 6-, 7-, or 8-bit word length is selected, two stop bits are generated.

The Receiver checks the first stop-bit only, regardless of the number of stop bits selected.

RW 0x0
[1:0] Data Length Select (dls)

Selects the number of data bits per character that the peripheral will transmit and receive.

  • 0 - 5 data bits per character
  • 1 - 6 data bits per character
  • 2 - 7 data bits per character
  • 3 - 8 data bits per character
RW 0x0